Pilot controlled diaphragm valve



Aug. 10, 1954 A. RABAL PILOT CONTROLLED DIAPHRAGM VALVE Filed Oct. 28, 1948 FIG/I.

2 Shets-Sheet 1 Aug. 10, 1954 A. RABAL PILOT CONTROLLED DIAPHRAGM VALVE 2 Sheets-Sheet 2 Filed @Oct. 28, 1948 Patented Aug. 10, 1954 2,686,03345 PILOT CONTROLLED DIA'BHRAGMNALVE Alfredo Rahal; "Juniii, Buenos= Aires; Alrgentiiia- I Applicationflctoben 28, 1948;.Serial No. 56,9691--- 3* Claims" Cl." 251' 4'6 The present invention relates .to. an automatic biz-pass .valve .intendedtd improve the mode of supplying liquidior the, .difieitentl uses of iisual tapsor. faucetsionwhicha. fioatis needed to keep water .atl average 1'evel,. gsuchs as .tanks,.. wateritroughs,.water-closetcontainers,etc.- it

This .valve: is. intendedto. overcomepresent (use adv'a-ntagesin water supply; thus .savi'ngiuseless expense and; ensuring efliciento peration, with the advantage that-itcan. be. operated; atsome. dis.- tance by. foot, legv orhand jjustby slightly press-F ingra button. .Owing to itsvstructure. the water hammer? hasebeenrcompletely eliminatedpl ln order that this invention be clearly unde'rstoodrandirto show ,the'waylitoperatesairr the accompanying. drawingsthe. different parts have reference. numbers.-.

Fig; I. "isra longitudinal sectionalrview ofLth valve shownreadyf for use".

Fig. 2 isa-plan view of the device.

Fig. 3- shows a planlview era modified iormflof the valveto beoperatedihy means are float. I

Fig..-, 4 a longitudinal. sectional vView of." the structure ofJFig. L3.

. Fig. v5 isia plan. view. of; a .moreseconomical structuraJNdesignfon use-in .water troughs operated by meansof afloat.

Fig. 6 is a longitudinal sectional view-oi Fig. 5.

Referringv now tdthedrawings l' is a casing of a special shape provided'with Ia fluid; supply passage. 2 which bends ati3and leads toa chamber. 5;.whi'ch is connected at. 6 withfanother ..tubular.. passage 1' 'whi'chbends'i at; 8'1 and has an outlet The. threaded" portion 1.! 0, is the. couplingfoi: the supplyipipe. and; the opposite part7 H. is the coupling, tor. the. drain pipe. The vaiv'ei casing. 1? has in its; middle. portion .afir'st. pressure. chamber; [2 with a wide opening I 3 closed by the rubber membrane. or .Vfiexible circular diaphragm (4 whose edges are held to the flange [5 by means of'ring l6 having/screwsdL Thewringz l iwhas a forkshaped extension I8 where lever I9 is rockably mounted on bolt 20.

Ring I6-has'diametricallyppposed to extension l8- a fork shapedextension ZIia little displaced to" the central part where lever 22 balances on bolt 23'.

Lever i9 is providedon-"its" power arm'witrr an inclined flat disk portion 2 4 whose surface bears ondiaphragm 14:

At the resistance arm of lever [9 a rubber semisphere 25 is arranged, held by screw 28 and nut 21.

Lever 22 has in its resistance arm a hole 28 where the rubber knob 29 is mounted which is used to close hole 30 in ring IS. The hole 30 is ex- 2t, tended sthroughudiaph-ragm. Mand the inner flange l5 and-connects the. pressure, chamber [2 with chambe'r 51.-

The end 31' of lever. 22 bears'againstvthe cylind'rical'part 32 which moves freely'in hole 33' of 'lid 34; .7 which; has in' its upper middle portion, a threaded.projection35" and an annular projection 36l'osed by aflrubher cap 31. a

38 is a nut threaded at 35'which by means onecessedv portionfl presses the washer 40 against thered'geroflcap ,37; Nut 3 8 has in itscentr'ai part a threaded hole" 41'' intot-which-fpart 42' is screwed which-has a hole 43 "and :an'exte'nsiorr 44 of this hole'of smaller diameter."

45isla fiexible'p pc connected with part 42. In hole" are piston 46' moves;axially. and carries the fi'exiblerod'fl which moves freely withinrpipe 45. 48 is a projecting portion of lid 3'4i'w-itl-i'a recess v 49 where spring 50. is housed. which abuts withji't'slower end. on theresista'nce arm of lever. 22; 5f. are the .screws'that hold'the1id'34' against chest I) The lower portion of casing v l hasaprojecting portion witha holein its central part" 53 threaded at.54'.and another threaded. coaxial hole'oi smaller diameter. SE is a hole that connects'pipe 2 with pressure chamber lZl A nut threaded at 54" is provided :withfa holei'n itscentral 'portion through whichjia threaded needle'valvejrod 59' passes and extends through pipe 2 and c'hecks at GGthe water passagefrompipe Z tothe pressure'chamber I21 The packinginthe: central" part 53 iscompressed by said nut 1 In the. form of Figs, 3 and-4, the valve operate ingrl'efver 62 hasa float 65' fastened "onthe reduced portionfi'iii'by means oil a nut 6'6 andthreads 64".

In". Figs. 5 andfbja rubber ring ;6T engageswith itsioutertperimeter. recess 680i part i; 'and'with itsLinner'perimeter the outer surface of feed pipe 59 's'ovas to. preventl'e'aks'.

The end offeedlpipe fiq projectsinto recess 10 ofipart. l to keep the device inahorizontal positi'on.

Tl isa tubularpart that connects tube 2 with pressure. chamber I2 by meansof holes 12' anew. The tubular part H? has projections Hand. 15 and i't is.-fi3ied on projections 16 ofpart I and on thepart H'whi'ch'fo'rms the. pressure chamber I12; by'rneansoiscrewsand' bolts.

. Operations In the arrang'ementofFfg-"l tobe used" instead of the usual faucets, the valve is shown in closing condition. In said position spring presses the rubber knob 29 against hole 30 keeping it closed. The water that passes from tube 2 to pressure chamber l2 through hole 56 regulated by point 60 presses on diaphragm l4 and through this on disc 24, thus it operates lever I9 and presses the rubber semisphere 25 against seat 4 closing it.

When by any means the flexible rod 41 is being displaced toward the inner part of the valve, the piston 46 transmits its displacement to the cylindrical part 36 through the rubber cap 3'! whose part 32 operates lever 22 compressing spring 50 and separating the rubber knob 29 from hole 30. The water in pressure chamber l2 passes to chamber through hole 30 in greater quantity than it is replaced through regulated hole 55 and pressure in chamber 1 2 is considerably reduced, while the pressure fluid in the passage 2, being already free from counter-pressure of chamber 12, lifts the rubber semi-sphere 25 from seat 4, passes to chamber 5 and together with the discharge from hole 30 passes into passage 7 and through mouth 9 to the drain pipe.

When the operation of the flexible rod 41 ceases, spring 50 reacts closing hole 3! The water passing through the regulated hole 56 accumulates in chamber l2 and pressing on disc 24 through diaphragm l 4 operates lever 19, thereby pressing the rubber semi-sphere 25 against mouth 4 and closing the valve owing to the difierence of effective surfaces between diaphragm l4 and valve 25.

In the arrangement of the valve in Figures 3, 4, 5 and 6 lever 62 is operated by float 65, which responds to the level of liquid in a container into which the passage 2 empties.

It is understood that in carrying out this invention, the most suitable materials may be used, and that slight constructive alterations may be made which would fall within the scope of this invention.

I claim:

1. In an automatic by-pass valve comprising a valve casing having a valve chamber and a flexible diaphragm closing the latter, the combination of a fluid supply passage in the valve casing terminating in a valve seat at one end and connectible at the other end to a fluid supply; a lever disposed exteriorly of the valve chamber and pivoted intermediate the ends thereof to the valve casing with one end forming a valve closure cooperating with the valve seat and at the other end terminating in a portion bearing'on the diaphragm; the valve casing having a first passage leading from the fluid supply passage into said valve chamber; said valve casing having a second passage of larger capacity than said first passage leading from the interior of said valve chamber to the exterior of said diaphragm independently of said fluid supply passage; and a second lever pivoted to said valve casing and having a closure portion thereon for closing the second passage and one end remote from said closure portion movable through an arc from one position in which the closure portion on said lever closes said second passage to another position in which said closure portion is spaced away from and thus opens said second passage.

2. In an automatic by-pass valve comprising a valve casing having a first valve chamber and a flexible diaphragm closing the latter, the combination of a fluid supply passage in the valve casing terminating in a valve seat at one end and connectible at the other end to a fluid supply, the valve casing having a second valve chamber exteriorly of the diaphragm and a fluid outlet passage leading outwardly from the second valve chamber; a lever disposed within the latter valve chamber and pivoted intermediate the ends thereof to the valve casing with one and forming a valve closure cooperating with the valve seat and at the other end terminating in a portion bearing on the diaphragm; the valve casing having a first passage leading from the fluid supply passage into the first valve chamber; said valve casing having a second passage of larger capacity than said first passage leading from the interior of said first valve chamber into said second valve chamber independently of said fluid supply passage; and a second lever pivoted to said valve casing within said second valve chamber and having a closure portion thereon for closing the second passage and one end remote from said closure portion movable through an are from one position in which the closure portion on said lever closes said second passage to another position in which said closure portion is spaced away from and thus opens said second passage.

3. In an automatic by-pass valve comprising a valve casing having a first valve chamber and a flexible diaphragm closing the latter, the combination of a fluid supply passage in the valve casing terminating in a valve seat at one end and connectible at the other end to a fluid supply, the valve casing having a second valve chamber exteriorly of the diaphragm and a fluid outlet passage leading outwardly from the second valve chamber; a lever disposed within the latter valve chamber and pivoted intermediate the ends thereof to the valve casing intermediate the valve seat and the diaphragm in the latter with one end of the lever forming a valve closure cooperating with said valve seat and the other end terminating in an inclined flat portion bearing on the diaphragm; the valve casing having a first passage leading from the fluid supply passage into the first chamber; an exteriorly accessible and independently operable needle valve having the inner end thereof cooperating with the first passage whereby to open and close the same at will; said valve casing having a second passage of larger capacity than said first passage leading from the interior of said first valve chamber into said second valve chamber independently of said fluid supply passage; and a second lever pivoted to said valve casing within said second valve chamber and having a closure portion thereon for closing the second passage and one end remote from said closure portion movable through an arc from one position in which the closure portion on said lever closes said second passage to another position in which said closure portion is spaced away from and thus opens said second passage.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date ,'408,687, Brandly Aug. 13, 1889 453,997 Folger et a1 June 9, 1891 595,061 Gulland Dec. 7, 1897 917,443 John Apr. 6, 1909 925,538 Weaver June 22, 1909 2,338,760 Deming Jan. 11, 1944 2,461,615 Taylor Feb. 15, 1949 

